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Let the test results show, I am the father of the air box to spa filter conversion!? Is there a way to post videos on here?! No to many people thought this mod was gonna pass. But after some testing on the factory air box and tuning the spa filter with foam I got it to the exact same flow as the factory box and filter. Mock up for start up test and rev test. And WALLA! Idled perfect for about 10 mins, rev perfect any way I mashed or held the throttle.

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it’s a sealed filter unit made and designed to keep running water in. So it’s guaranteed to keep water out. I didn’t want to worry about trying to seal the factory air box and reseal every time I needed to check or change the air filter. It was about 15$ and I spent about hr testing both factory system and spa filter. I wanted something that looked good and not just factory all siliconed and rigged up and I didn’t want 10 different peace’s and fitting looking like a plumber on meth. Lmao. And with other mods like my 400ex rear shock conversion I had to lose the factory air box for clearance. Just another one of my genius ideas. You can follow my build on my Facebook page Coronna Customs / Coronna Racing.

Super Moderator

Ok thanks, makes a bit more sense knowing the original airbox won't fit anymore. Its probably OK that you have mentioned your FB page once or twice so far, but unless you become an approved supporting vendor on this site, you'll soon be warned or deleted if advertising. Have fun.

Premium Member

I see a lot of people silicone the air box cover to the box , I don't , I apply a thick bead of aquarium silicone to the groove in the cover where the box seals over the o-ring , wet my finger with alcohol and smooth it flat , let it dry for a day , then install the cover , it fits much tighter , doesn't leak and is removable if necessary

what your spark plug looks like is the key to if the air flow is right

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Hi all,
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